
    var ali = document.querySelectorAll(".fon .ul5 li");
    var aitem = document.querySelectorAll(".fon .cont .item");
    var index=0;
    ali[index].className = "active";
    aitem[index].style.display = "block";
    for(var i=0;i<ali.length;i++){
        ali[i].xuhao = i;
        ali[i].onmouseover = function(){
            ali[index].className = "";
            aitem[index].style.display = "none";

            this.className = "active";
            aitem[this.xuhao].style.display = "block";
        
            index = this.xuhao;
        }
        
    }
    